Google Inc. hasn't done enough to satisfy an investigation by multiple states into whether it adequately screens illegal drug advertisements and illicit online videos, Mississippi's top law enforcement official said.

Now state Attorney General Jim Hood plans to demand additional information from Google to see if the company is profiting from those activities.

The demand shows state and federal governments stepping up enforcement actions against large companies to curb online sales of counterfeit and illegal goods and content, which have grown into an $18 billion underground industry, according to Javelin Strategy & Research Inc. FedEx Corp. was charged by the U.S. on July 17 for delivering prescription pain pills, sedatives and other controlled substances shipped by illegal Internet pharmacies. In 2011, Google agreed to forfeit $500 million to settle Justice Department allegations that advertising on its site by Canadian pharmacies led to illegal imports of prescription drugs.

Google said it takes user safety seriously and continually removes illegal ads and content, such as videos exploiting children. The Mountain View company operates the Web's largest search engine, as well as video-sharing website YouTube.

Mississippi plans to issue a civil investigative demand - similar to a subpoena - for "documents and e-mails about how they screen or don't screen videos and ads" and "how they place ads beside videos," Hood said.

Two dozen attorneys general sent Google a letter in December alleging the company profits from "dangerous and illegal content" and that its services promote illicit and prescription-free drugs. The letter was followed by in-person meetings with company executives in January and February, Hood said.

A Google spokeswoman, Niki Christoff, described actions the company has taken to block illegal ads and content related to the exploitation of children.

"We take the safety of our users very seriously and we've explained to Attorney General Hood how we enforce policies to combat rogue online pharmacies and counterfeit drugs," Christoff said in an e-mail.